Consistently going to sleep and waking up at the same time each day can have an impact on your body weight, researchers from Brigham Young University (BYU) claim in a new study. BYU exercise science professor Bruce Bailey and his colleagues recruited over 300 women between the ages of 17 and 26 from two major universities in the western US. They studied those female subjects over the course of several weeks, and concluded that those women who had the best sleeping habits also maintained healthier body weights.